does your downpipe make any creaking noises when the engine is cold or when the rpm dips below 800rpm which causes the engine to vibrate more? I think its the spring thats making the noise where the downpipe is connected to.

 

What downpipe are you using? How long has it been on the car?

I put a used generic downpipe on mine a few months ago, it came with a hks carbon/ti I bought used. Turned out it was touching my oil pan. Not good. It was rubbing on the pan causing a creak sound sometimes. You might want to check your clearances. I switched to a turboxs dp, correct fit.

 

I have Invidia DP and never had a problem until now. Had the dp for about 6k miles so far. My downpipe is wrapped with the heat thingy so i know that sound cant be the dp rubbing the oil pan. The sound is exactly like a old rusted spring when it creaks when you bend it. kinda like those animal spring rides you see at the park with a huge spring supporting it and makes that creaking noise when rocking back and forth Ill jack up the car and take a look next time.. its funny that it only happens in the morning on the way to work...at night time the sound is gone

 

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I was thinking maybe your downpipe is expanding against your heat wrap causing the sound. I assume you have a that cloth looking heat wrap.